This is the related issue tracker: http://javafx-jira.kenai.com/browse/RT-3458 "Camera and Microphone"

It is scheduled for Lombard with the initial Java 8/JavaFX 8 release (which has general availability in September, 2013).
I don't think there have been no check-ins related to it on the JavaFX 8 branch, so (IMO) there is high probability that the feature will be cut from the JavaFX 8 branch.

In the meantime there is a sample open source project which integrates JavaFX and the LTI-Civil video capture library, which you could try if you wished:
http://code.google.com/p/jfxcamera/source/browse/trunk/